To truly appreciate Detroit's landmark skyscraper, you have to step inside.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

These curious caverns have been home to mushrooms, gangsters, and disco.

This cave holds a surprisingly colorful variety of geological oddities.

The site of an ancient Mississippian settlement that appears to have flourished during the 10th to 13th centuries.

Home to the world's largest refracting telescope and the birthplace of modern astrophysics.

A historic ballroom host to famous performers from the big band era to 1980s rock.

According to the legend, this strikingly beautiful hill has miraculous healing powers.

The Bong-area park police have asked visitors to please, stop stealing the signs.

Wisconsin's most celebrated export gets the royal treatment on I-94.

The spaceship-like theater, which is still in use, was one of the most popular exhibits at the 1964 New York World's Fair.

One of the oldest and tallest lighthouses still in service on Lake Michigan.

A wonderfully curated used bookstore in an airport.

The preserved remains of the former Milwaukee County Hospital for the Insane are hidden in the wooded grounds of County Park.

Robots, lasers, and whoopee cushions, oh my!

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

A unique botanical garden housed in three giant geodesic domes.

Six tiny houses built for working class people form the largest intentional cluster of Wright homes anywhere.

The oldest certified bowling alley in the United States is in the basement of this century-old bar.

This rooftop sign has been confusing Milwaukee-bound airline passengers for decades.

This storied music venue was once a tavern that housed an Italian Anarchist book club and prohibition parties; today it's a community space for artists and musicians.

The last original miniature duckpin bowling lanes in America, located in a Milwaukee dive bar.

This was once the largest four-sided clock in the world (yes, even bigger than Big Ben).

Once a speakeasy operated by Al Capone, this Milwaukee cigar bar is now a haven for ghost hunters.